tp_data 数据表
value()
$name = Db::name('data')
-> where('id', 16)
-> value('name');
print_r($name);
// 获取 tp_data 数据表中 id = 16，name 字段的值,并打印
// 结果：1111
/** 原生sql语句
>Prepare SELECT `name` FROM `tp_data` WHERE `id` = ? LIMIT 1
>Execute SELECT `name` FROM `tp_data` WHERE `id` = 16 LIMIT 1
*/
column()
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获取一列满足条件的数据
$list = Db::name('data)
-> where('status', 1)
-> column('name');
print_r($list);
// 从 tp_data 数据表获取一列 status = 1 的 name 字段值
/** 结果：
Array(
[0] => thinkphp
[1] => thinkphp
[2] => thinkphp
[3] => thinkphp
[4] => 7777777777
[5] => thinkphp
[6] => thinkphp
[7] => thinkphp
[8] => thinkphp
)
*/
获取一列满足条件的数据，并以id值为键名
$list = Db::name('data)
-> where('status', 1)
-> column('name', 'id');
print_r($list);
// 从 tp_data 数据表获取一列 status=1 的 name 字段值集合
/** 结果：
Array(
[3] => thinkphp
[4] => thinkphp
[5] => thinkphp
[6] => thinkphp
[7] => 7777777777
[8] => thinkphp
[9] => thinkphp
[10] => thinkphp
[11] => thinkphp
)
*/
获取以id为键名的数据集
$list = Db::name('data')
-> where('status', 1)
-> column('*', 'id');
print_r($list);
// 从 tp_data 数据表获取一列 status=1 的数据集
/** 结果：
Array(
[3] => Array(
[id] => 3
[name] => thinkphp
[status] => 1
)
[4] => Array(
[id] => 4
[name] => thinkphp
[status] => 1
)
[5] => Array(
[id] => 5
[name] => thinkphp
[status] => 1
)
...
)
*/
聚合查询
count
max
min
avg
sum
统计 data 表的数据
$count = Db::name('data')
-> where('status', 1)
-> count();
echo $count;
// 结果：9
统计 data 表的最大 id
$max = Db::name('data')
-> where('status', 1)
-> max('id);
echo $max;
// 结果：11
简单查询
$result = Db::name('data')
-> where("id > :id and name like :name",
[
'id' => 10,
'name' => "%php%"
])
-> select();
print_r($result);
/** 结果：
Array(
[0] => Array(
[id] => 11
[name] => thinkphp
[status] => 1
)
)
*/
/** 原生sql语句：
>Prepare SELECT * FROM `tp_data` WHERE (id > ? and name like ?)
>Execute SELECT * FROM `tp_data` WHERE (id > '10' and name like '%php%')
*/
日期查询
日期类型int，时间戳格式
查询时间大于 2016-1-1 的数据
$result = Db::name('users')
-> whereTime('reg_time', '>', '2016-1-1')
-> select();
print_r($result);
/** 原生sql语句：
>Prepare SELECT * FROM `tp_users` WHERE `reg_time` > ?
>Execute SELECT * FROM `tp_users` WHERE `reg_time` > 1451577600
*/
查询本周
$result = Db::name('users')
-> whereTime('reg_time', '>', 'this week')
-> select();
print_r($result);
// 从本周星期一开始
查询最近两天添加的数据
$result = Db::name('users')
-> whereTime('reg_time', '>', '-2 days')
-> select();
print_r($result);
查询创建时间在 2016-1-1 ~ 2017-7-1 的数据
$result = Db::name('users')
-> whereTime('reg_time', 'between', ['2016-1-1', '2017-7-1'])
-> select();
print_r($result);
/** 原生sql语句：
>Prepare SELECT * FROM `tp_users` WHERE `reg_time` BETWEEN ? AND ?
>Execute SELECT * FROM `tp_users` WHERE `reg_time` BETWEEN 1451577600 AND 1483200000
*/
查询今天的数据
昨天：yesterday
本周：week
上周：last week
$result = Db::name('users')
-> whereTime('reg_time', 'today')
-> select();
print_r($result);
分块查询
Db::name('data')
-> where('status', '>', 0)
-> chunk(null, function($list) {
foreach($list as $data) {
//处理2条记录
}
});
/** 原生sql语句：
>Prepare SELECT * FROM `tp_data` WHERE `status` > ? ORDER BY `id` asc LIMIT 2
>Execute SELECT * FROM `tp_data` WHERE `status` > 0 ORDER BY `id` asc LIMIT 2
>Close stmt
>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2
>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 4 ORDER BY `id` asc LIMIT 2
>Close stmt
>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2
>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 6 ORDER BY `id` asc LIMIT 2
>Close stmt
...
>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2
>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 16 ORDER BY `id` asc LIMIT 2
>Close stmt
>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2
>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 17 ORDER BY `id` asc LIMIT 2
>Close stmt
*/
改进
$p = 0;
do {
$result = Db::name('data') -> limit($p, 2) -> select();
$p += 2;
//处理数据
} while(count($result) > 0);
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